<?php

namespace App\Http\Utils;
Class UnlimitedLevel
{
    //组合一维数组
    public static function unlimitedForLevel($cate, $html = '──', $pid = 0, $level = 0)
    {
        $arr = array();
        foreach ($cate as $v) {
            if ($v['parent_id'] == $pid) {
                $v['level'] = $level + 1;
                if ($level == 0) {
                    $v['html'] = "◤";
                } else {
                    $v['html'] = "├─" . str_repeat($html, $level);
                }
                $arr[] = $v;
                $arr = array_merge($arr, self::unlimitedForLevel($cate, $html, $v['id'], $level + 1));
            }
        }
        return $arr;
    }

    //组合多维数组
    public static function unlimitedForLayer($cate, $name = 'child', $pid = 0)
    {
        $arr = array();
        foreach ($cate as $v) {
            if ($v['pid'] == $pid) {
                $v[$name] = self::unlimitedForLayer($cate, $name, $v['id']);
                $arr[] = $v;
            }
        }
        return $arr;
    }

    //传递一个子分类ID返回所有的父级分类
    public static function getParents($cate, $id)
    {
        $arr = array();
        foreach ($cate as $v) {
            if ($v['cate_id'] == $id) {
                $arr[] = $v;
                $arr = array_merge(self::getParents($cate, $v['cate_pid']), $arr);
            }
        }
        return $arr;
    }

    //传递一个父级ID返回所有子级ID
    public static function getChildsId($cate, $pid)
    {
        $arr = array();
        foreach ($cate as $v) {
            if ($v['pid'] == $pid) {
                $arr[] = $v['id'];
                $arr = array_merge($arr, self::getChildsId($cate, $v['id']));
            }
        }
        return $arr;
    }

    //传递一个父ID返回所有子级类
    public static function getChilds($cate, $pid)
    {
        $arr = array();
        foreach ($cate as $v) {
            if ($v['cate_pid'] == $pid) {
                $arr[] = $v;
                $arr = array_merge($arr, self::getChilds($cate, $v['cate_id']));
            }
        }
        return $arr;
    }
}

